Kconfig 14 KB

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  1. #
  2. # For a description of the syntax of this configuration file,
  3. # see Documentation/kbuild/kconfig-language.txt.
  4. #
  5. config MMU
  6. bool
  7. default y
  8. config RWSEM_GENERIC_SPINLOCK
  9. bool
  10. config RWSEM_XCHGADD_ALGORITHM
  11. bool
  12. default y
  13. config GENERIC_CALIBRATE_DELAY
  14. bool
  15. default y
  16. config GENERIC_BUST_SPINLOCK
  17. bool
  18. mainmenu "Linux Kernel Configuration"
  19. config S390
  20. bool
  21. default y
  22. source "init/Kconfig"
  23. menu "Base setup"
  24. comment "Processor type and features"
  25. config 64BIT
  26. bool "64 bit kernel"
  27. help
  28. Select this option if you have a 64 bit IBM zSeries machine
  29. and want to use the 64 bit addressing mode.
  30. config SMP
  31. bool "Symmetric multi-processing support"
  32. ---help---
  33. This enables support for systems with more than one CPU. If you have
  34. a system with only one CPU, like most personal computers, say N. If
  35. you have a system with more than one CPU, say Y.
  36. If you say N here, the kernel will run on single and multiprocessor
  37. machines, but will use only one CPU of a multiprocessor machine. If
  38. you say Y here, the kernel will run on many, but not all,
  39. singleprocessor machines. On a singleprocessor machine, the kernel
  40. will run faster if you say N here.
  41. See also the <file:Documentation/smp.txt> and the SMP-HOWTO
  42. available at <http://www.tldp.org/docs.html#howto>.
  43. Even if you don't know what to do here, say Y.
  44. config NR_CPUS
  45. int "Maximum number of CPUs (2-64)"
  46. range 2 64
  47. depends on SMP
  48. default "32"
  49. help
  50. This allows you to specify the maximum number of CPUs which this
  51. kernel will support. The maximum supported value is 64 and the
  52. minimum value which makes sense is 2.
  53. This is purely to save memory - each supported CPU adds
  54. approximately sixteen kilobytes to the kernel image.
  55. config HOTPLUG_CPU
  56. bool "Support for hot-pluggable CPUs"
  57. depends on SMP
  58. select HOTPLUG
  59. default n
  60. help
  61. Say Y here to be able to turn CPUs off and on. CPUs
  62. can be controlled through /sys/devices/system/cpu/cpu#.
  63. Say N if you want to disable CPU hotplug.
  64. config MATHEMU
  65. bool "IEEE FPU emulation"
  66. depends on MARCH_G5
  67. help
  68. This option is required for IEEE compliant floating point arithmetic
  69. on older S/390 machines. Say Y unless you know your machine doesn't
  70. need this.
  71. config COMPAT
  72. bool "Kernel support for 31 bit emulation"
  73. depends on 64BIT
  74. help
  75. Select this option if you want to enable your system kernel to
  76. handle system-calls from ELF binaries for 31 bit ESA. This option
  77. (and some other stuff like libraries and such) is needed for
  78. executing 31 bit applications. It is safe to say "Y".
  79. config SYSVIPC_COMPAT
  80. bool
  81. depends on COMPAT && SYSVIPC
  82. default y
  83. config BINFMT_ELF32
  84. tristate "Kernel support for 31 bit ELF binaries"
  85. depends on COMPAT
  86. help
  87. This allows you to run 32-bit Linux/ELF binaries on your zSeries
  88. in 64 bit mode. Everybody wants this; say Y.
  89. comment "Code generation options"
  90. choice
  91. prompt "Processor type"
  92. default MARCH_G5
  93. config MARCH_G5
  94. bool "S/390 model G5 and G6"
  95. depends on !64BIT
  96. help
  97. Select this to build a 31 bit kernel that works
  98. on all S/390 and zSeries machines.
  99. config MARCH_Z900
  100. bool "IBM eServer zSeries model z800 and z900"
  101. help
  102. Select this to optimize for zSeries machines. This
  103. will enable some optimizations that are not available
  104. on older 31 bit only CPUs.
  105. config MARCH_Z990
  106. bool "IBM eServer zSeries model z890 and z990"
  107. help
  108. Select this enable optimizations for model z890/z990.
  109. This will be slightly faster but does not work on
  110. older machines such as the z900.
  111. endchoice
  112. config PACK_STACK
  113. bool "Pack kernel stack"
  114. help
  115. This option enables the compiler option -mkernel-backchain if it
  116. is available. If the option is available the compiler supports
  117. the new stack layout which dramatically reduces the minimum stack
  118. frame size. With an old compiler a non-leaf function needs a
  119. minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
  120. -mkernel-backchain the minimum size drops to 16 byte on 31 bit
  121. and 24 byte on 64 bit.
  122. Say Y if you are unsure.
  123. config SMALL_STACK
  124. bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb"
  125. depends on PACK_STACK
  126. help
  127. If you say Y here and the compiler supports the -mkernel-backchain
  128. option the kernel will use a smaller kernel stack size. For 31 bit
  129. the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb
  130. instead of 16kb. This allows to run more thread on a system and
  131. reduces the pressure on the memory management for higher order
  132. page allocations.
  133. Say N if you are unsure.
  134. config CHECK_STACK
  135. bool "Detect kernel stack overflow"
  136. help
  137. This option enables the compiler option -mstack-guard and
  138. -mstack-size if they are available. If the compiler supports them
  139. it will emit additional code to each function prolog to trigger
  140. an illegal operation if the kernel stack is about to overflow.
  141. Say N if you are unsure.
  142. config STACK_GUARD
  143. int "Size of the guard area (128-1024)"
  144. range 128 1024
  145. depends on CHECK_STACK
  146. default "256"
  147. help
  148. This allows you to specify the size of the guard area at the lower
  149. end of the kernel stack. If the kernel stack points into the guard
  150. area on function entry an illegal operation is triggered. The size
  151. needs to be a power of 2. Please keep in mind that the size of an
  152. interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
  153. The minimum size for the stack guard should be 256 for 31 bit and
  154. 512 for 64 bit.
  155. config WARN_STACK
  156. bool "Emit compiler warnings for function with broken stack usage"
  157. help
  158. This option enables the compiler options -mwarn-framesize and
  159. -mwarn-dynamicstack. If the compiler supports these options it
  160. will generate warnings for function which either use alloca or
  161. create a stack frame bigger then CONFIG_WARN_STACK_SIZE.
  162. Say N if you are unsure.
  163. config WARN_STACK_SIZE
  164. int "Maximum frame size considered safe (128-2048)"
  165. range 128 2048
  166. depends on WARN_STACK
  167. default "256"
  168. help
  169. This allows you to specify the maximum frame size a function may
  170. have without the compiler complaining about it.
  171. source "mm/Kconfig"
  172. comment "I/O subsystem configuration"
  173. config MACHCHK_WARNING
  174. bool "Process warning machine checks"
  175. help
  176. Select this option if you want the machine check handler on IBM S/390 or
  177. zSeries to process warning machine checks (e.g. on power failures).
  178. If unsure, say "Y".
  179. config QDIO
  180. tristate "QDIO support"
  181. ---help---
  182. This driver provides the Queued Direct I/O base support for
  183. IBM mainframes.
  184. For details please refer to the documentation provided by IBM at
  185. <http://www10.software.ibm.com/developerworks/opensource/linux390>
  186. To compile this driver as a module, choose M here: the
  187. module will be called qdio.
  188. If unsure, say Y.
  189. config QDIO_PERF_STATS
  190. bool "Performance statistics in /proc"
  191. depends on QDIO
  192. help
  193. Say Y here to get performance statistics in /proc/qdio_perf
  194. If unsure, say N.
  195. config QDIO_DEBUG
  196. bool "Extended debugging information"
  197. depends on QDIO
  198. help
  199. Say Y here to get extended debugging output in
  200. /sys/kernel/debug/s390dbf/qdio...
  201. Warning: this option reduces the performance of the QDIO module.
  202. If unsure, say N.
  203. comment "Misc"
  204. config PREEMPT
  205. bool "Preemptible Kernel"
  206. help
  207. This option reduces the latency of the kernel when reacting to
  208. real-time or interactive events by allowing a low priority process to
  209. be preempted even if it is in kernel mode executing a system call.
  210. This allows applications to run more reliably even when the system is
  211. under load.
  212. Say N if you are unsure.
  213. config IPL
  214. bool "Builtin IPL record support"
  215. help
  216. If you want to use the produced kernel to IPL directly from a
  217. device, you have to merge a bootsector specific to the device
  218. into the first bytes of the kernel. You will have to select the
  219. IPL device.
  220. choice
  221. prompt "IPL method generated into head.S"
  222. depends on IPL
  223. default IPL_TAPE
  224. help
  225. Select "tape" if you want to IPL the image from a Tape.
  226. Select "vm_reader" if you are running under VM/ESA and want
  227. to IPL the image from the emulated card reader.
  228. config IPL_TAPE
  229. bool "tape"
  230. config IPL_VM
  231. bool "vm_reader"
  232. endchoice
  233. source "fs/Kconfig.binfmt"
  234. config PROCESS_DEBUG
  235. bool "Show crashed user process info"
  236. help
  237. Say Y to print all process fault locations to the console. This is
  238. a debugging option; you probably do not want to set it unless you
  239. are an S390 port maintainer.
  240. config PFAULT
  241. bool "Pseudo page fault support"
  242. help
  243. Select this option, if you want to use PFAULT pseudo page fault
  244. handling under VM. If running native or in LPAR, this option
  245. has no effect. If your VM does not support PFAULT, PAGEEX
  246. pseudo page fault handling will be used.
  247. Note that VM 4.2 supports PFAULT but has a bug in its
  248. implementation that causes some problems.
  249. Everybody who wants to run Linux under VM != VM4.2 should select
  250. this option.
  251. config SHARED_KERNEL
  252. bool "VM shared kernel support"
  253. help
  254. Select this option, if you want to share the text segment of the
  255. Linux kernel between different VM guests. This reduces memory
  256. usage with lots of guests but greatly increases kernel size.
  257. You should only select this option if you know what you are
  258. doing and want to exploit this feature.
  259. config CMM
  260. tristate "Cooperative memory management"
  261. help
  262. Select this option, if you want to enable the kernel interface
  263. to reduce the memory size of the system. This is accomplished
  264. by allocating pages of memory and put them "on hold". This only
  265. makes sense for a system running under VM where the unused pages
  266. will be reused by VM for other guest systems. The interface
  267. allows an external monitor to balance memory of many systems.
  268. Everybody who wants to run Linux under VM should select this
  269. option.
  270. config CMM_PROC
  271. bool "/proc interface to cooperative memory management"
  272. depends on CMM
  273. help
  274. Select this option to enable the /proc interface to the
  275. cooperative memory management.
  276. config CMM_IUCV
  277. bool "IUCV special message interface to cooperative memory management"
  278. depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
  279. help
  280. Select this option to enable the special message interface to
  281. the cooperative memory management.
  282. config VIRT_TIMER
  283. bool "Virtual CPU timer support"
  284. help
  285. This provides a kernel interface for virtual CPU timers.
  286. Default is disabled.
  287. config VIRT_CPU_ACCOUNTING
  288. bool "Base user process accounting on virtual cpu timer"
  289. depends on VIRT_TIMER
  290. help
  291. Select this option to use CPU timer deltas to do user
  292. process accounting.
  293. config APPLDATA_BASE
  294. bool "Linux - VM Monitor Stream, base infrastructure"
  295. depends on PROC_FS && VIRT_TIMER=y
  296. help
  297. This provides a kernel interface for creating and updating z/VM APPLDATA
  298. monitor records. The monitor records are updated at certain time
  299. intervals, once the timer is started.
  300. Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
  301. i.e. enables or disables monitoring on the Linux side.
  302. A custom interval value (in seconds) can be written to
  303. /proc/appldata/interval.
  304. Defaults are 60 seconds interval and timer off.
  305. The /proc entries can also be read from, showing the current settings.
  306. config APPLDATA_MEM
  307. tristate "Monitor memory management statistics"
  308. depends on APPLDATA_BASE
  309. help
  310. This provides memory management related data to the Linux - VM Monitor
  311. Stream, like paging/swapping rate, memory utilisation, etc.
  312. Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
  313. APPLDATA monitor record, i.e. enables or disables monitoring this record
  314. on the z/VM side.
  315. Default is disabled.
  316. The /proc entry can also be read from, showing the current settings.
  317. This can also be compiled as a module, which will be called
  318. appldata_mem.o.
  319. config APPLDATA_OS
  320. tristate "Monitor OS statistics"
  321. depends on APPLDATA_BASE
  322. help
  323. This provides OS related data to the Linux - VM Monitor Stream, like
  324. CPU utilisation, etc.
  325. Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
  326. APPLDATA monitor record, i.e. enables or disables monitoring this record
  327. on the z/VM side.
  328. Default is disabled.
  329. This can also be compiled as a module, which will be called
  330. appldata_os.o.
  331. config APPLDATA_NET_SUM
  332. tristate "Monitor overall network statistics"
  333. depends on APPLDATA_BASE
  334. help
  335. This provides network related data to the Linux - VM Monitor Stream,
  336. currently there is only a total sum of network I/O statistics, no
  337. per-interface data.
  338. Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
  339. APPLDATA monitor record, i.e. enables or disables monitoring this record
  340. on the z/VM side.
  341. Default is disabled.
  342. This can also be compiled as a module, which will be called
  343. appldata_net_sum.o.
  344. config NO_IDLE_HZ
  345. bool "No HZ timer ticks in idle"
  346. help
  347. Switches the regular HZ timer off when the system is going idle.
  348. This helps z/VM to detect that the Linux system is idle. VM can
  349. then "swap-out" this guest which reduces memory usage. It also
  350. reduces the overhead of idle systems.
  351. The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer.
  352. hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ
  353. timer is active.
  354. config NO_IDLE_HZ_INIT
  355. bool "HZ timer in idle off by default"
  356. depends on NO_IDLE_HZ
  357. help
  358. The HZ timer is switched off in idle by default. That means the
  359. HZ timer is already disabled at boot time.
  360. config KEXEC
  361. bool "kexec system call (EXPERIMENTAL)"
  362. depends on EXPERIMENTAL
  363. help
  364. kexec is a system call that implements the ability to shutdown your
  365. current kernel, and to start another kernel. It is like a reboot
  366. but is independent of hardware/microcode support.
  367. endmenu
  368. source "net/Kconfig"
  369. config PCMCIA
  370. bool
  371. default n
  372. source "drivers/base/Kconfig"
  373. source "drivers/scsi/Kconfig"
  374. source "drivers/s390/Kconfig"
  375. source "drivers/net/Kconfig"
  376. source "fs/Kconfig"
  377. source "arch/s390/oprofile/Kconfig"
  378. source "arch/s390/Kconfig.debug"
  379. source "security/Kconfig"
  380. source "crypto/Kconfig"
  381. source "lib/Kconfig"